EP0149569A2 - Surveillance system switching between more observation sources - Google Patents

Surveillance system switching between more observation sources Download PDF

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Publication number
EP0149569A2
EP0149569A2 EP85400007A EP85400007A EP0149569A2 EP 0149569 A2 EP0149569 A2 EP 0149569A2 EP 85400007 A EP85400007 A EP 85400007A EP 85400007 A EP85400007 A EP 85400007A EP 0149569 A2 EP0149569 A2 EP 0149569A2
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EP
European Patent Office
Prior art keywords
switching
observation
surveillance system
priority
sources
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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EP85400007A
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German (de)
French (fr)
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EP0149569A3 (en
Inventor
Edouard Blomme
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Nouvelle Jules Verger Et Delporte Departement Blomme Automation Ste
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Nouvelle Jules Verger Et Delporte Departement Blomme Automation Ste
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Publication of EP0149569A2 publication Critical patent/EP0149569A2/en
Publication of EP0149569A3 publication Critical patent/EP0149569A3/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/194—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems
    • G08B13/196—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using image scanning and comparing systems using television cameras

Definitions

  • the present invention relates to surveillance systems that are installed in premises or other places, to detect the presence of intruders or observe break-ins, or more simply to keep track of individuals who have passed through.
  • these systems it is more particularly interested in those which comprise a plurality of observation cameras, intended to be judiciously distributed and positioned, and means for controlling a cyclic scanning of the different cameras. Its main aim is to avoid the loss of time caused by systematic cyclical and periodic scanning of the cameras and to increase the number and quality of the information collected.
  • the invention proposes a monitoring system of the type comprising a unit for managing information signals from a plurality of observation sources scanned in turn or in parallel, which is characterized in that it comprises a programmable switching unit, for determining an order of scanning of the observation sources, and means for controlling by priority the scanning of a particular observation source, in particular on detection of a corresponding event.
  • observation sources are mainly constituted by cameras or video recorders, sources of video signals which are explored and exploited individually under the control of the management unit.
  • this should not be seen as a limitation of the system of the invention.
  • this system can be used with all kinds of signal processing modes and event detection modes to be considered for each observation source.
  • We can for example provide visualizations or recordings on peripherals, the start-up of signals and remote controls, the operation on computer, for some, and for others, intrusion detectors, alarm sensors, or any electrical circuit in a loop which opens or closes when the event to be detected occurs, in particular an alarm.
  • the monitoring device essentially comprises a switching unit 1, comprising two self-switching matrices 2 and 3, and a management unit, the main body of which is a microprocessor 4, to which is associated a programmable read only memory (PROM) 5, which can be separated or integrated.
  • a switching unit 1 comprising two self-switching matrices 2 and 3
  • a management unit the main body of which is a microprocessor 4, to which is associated a programmable read only memory (PROM) 5, which can be separated or integrated.
  • PROM programmable read only memory
  • an input-output interface 6 has also been represented, through which the information coming in series from different alarm loops to be scanned, in order to be managed by the microprocessor, and control signals produced by the latter , to control for example the starting and stopping of a video recorder.
  • Each alarm loop includes a video camera which films a scene in the area it observes and the video recorder makes it possible to record, in series, for later viewing, the scenes observed by the cameras scanned successively.
  • the alarm loops were not shown individually. They are constituted in a conventional manner, each with an alarm detector on an electric loop circuit which opens or closes when the alarm detector is actuated and thus transmits alarm information to the microprocessor. Each loop is associated with a code which characterizes the alarm detector and which can also characterize a camera, according to a pre-established correspondence between alarm loops and cameras.
  • the switching unit is formed from self-switching matrices, which can be, for example, in the particular case described, matrices 2 and 3 of FIG. 1, of the type known under the trade designation MT 8804 from the American manufacturer Mittel .
  • the use of two conjugate matrices makes it possible to obtain eight information inputs El to E8 and eight outputs S1 to S8. Switching between the input channels and the output channels takes place automatically under the effect of serial control signals from the computer.
  • the succession of control orders is itself carried out according to three different diagrams which are selected by a priority order received by the microprocessor.
  • the inputs E1 to E8 of the switching unit admit to the matrices, by means of individual adjustable adaptation circuits 7, the various video signals coming from the surveillance devices, that is to say here, from eight cameras.
  • the signals obtained after switching on seven of the outputs, S1 to S7, can be sent to a control monitor or a video recorder displaying the state of all the switches, and possibly the corresponding images.
  • One of these outputs can also be used to view or record the scene captured by a priority camera selected by switching.
  • the eighth output is connected to the microprocessor 4 via a circuit 8 for shaping and synchronization.
  • FIG. 2 shows other elements incorporated in the management unit of the device.
  • an overlay device 9 which makes it possible to introduce, under the control of the microprocessor, into the output signals of the switching unit, indications which are superimposed on the images displayed. It is thus possible, for example, to embed the time at which an alarm occurs and a reference number of the camera then selected, in the corresponding video image.
  • a keyboard 11 allows manual input of information or commands. It can be used to modify the reference time for the insertion of the time indication. It can also be used to program the mie oprocessor of the cyclic switching command by relying on the parameters which are normally imposed by memory 5. It is used above all to modify the switching control diagram by manually introducing a priority command which determines the signal routing, based on a selection made by the user.
  • an auxiliary switch 12 receiving its control commands from the microprocessor 4, makes it possible to act on the cameras or the alarms of each loop, by selecting the one which is controlled according to the selection made by the switching unit.
  • Figure 3 will be understood by itself, it being specified that it illustrates how the device uses the orders of priority that it receives in the selection of the scanning patterns of the different cameras.
  • priority in switching is given first by a loop on which an alarm occurs, otherwise by the cyclic order imposed by the programmable memory, and otherwise by the command given manually on the keyboard. From the selection thus made, then depend the control orders transmitted to the switching unit, as well as those which control the overlay and the outputs of the auxiliary switch.
  • the start-up monitoring signal commands the resetting of the memories of the switching matrices (FIG. 4).
  • the corresponding reference code is memorized, with command to erase the memory of the switching matrices, and the synchronization of the video images is ensured (vertical synchronization).
  • the switching control signal is transmitted to a serial / parallel converter which transmits the logic states necessary for the operation of the switching.

Abstract

The invention relates to a surveillance system of the type comprising a unit (4) for managing data signals originating from a plurality of observation sources scanned in turns or in parallel, in which there is provided a programmable switching unit (1) for determining a scanning sequence of the said observation sources, and means for controlling the priority scanning of a particular observation source. <IMAGE>

Description

La présente invention concerne les systèmes de surveillance que l'on installe dans les locaux ou autres lieux, pour y déceler la présence d'intrus ou constater les effractions, ou plus simplement pour conserver une trace des individus qui y sont passés. Parmi ces systèmes, elle s'intéresse plus particulièrement à ceux qui comportent une pluralité de caméras d'observation, destinées à être judicieusement réparties et positionnées, et des moyens pour commander une scrutation cyclique des différentes caméras. Elle vise essentiellement à éviter les pertes de temps qu'entraine une scrutation cyclique et périodique systématique des caméras et à augmenter le nombre et la qualité des informations recueillies.The present invention relates to surveillance systems that are installed in premises or other places, to detect the presence of intruders or observe break-ins, or more simply to keep track of individuals who have passed through. Among these systems, it is more particularly interested in those which comprise a plurality of observation cameras, intended to be judiciously distributed and positioned, and means for controlling a cyclic scanning of the different cameras. Its main aim is to avoid the loss of time caused by systematic cyclical and periodic scanning of the cameras and to increase the number and quality of the information collected.

Dans ce but, l'invention propose un système de surveillance du type comportant une unité de gestion de signaux d'informations provenant d'une pluralité de sources d'observation scrutées à tour de rôle ou en parallèle, qui se caractérise en ce qu'il comporte une unité de commutation programmable, pour déterminer un ordre de scrutation des sources d'observation, et des moyens pour commander par priorité la scrutation d'une source d'observation particulière, notamment sur détection d'un évènement correspondant.To this end, the invention proposes a monitoring system of the type comprising a unit for managing information signals from a plurality of observation sources scanned in turn or in parallel, which is characterized in that it comprises a programmable switching unit, for determining an order of scanning of the observation sources, and means for controlling by priority the scanning of a particular observation source, in particular on detection of a corresponding event.

Dans la plupart des applications, les sources d'observation sont principalement constituées par des caméras ou magnétoscopes, sources de signaux vidéo qui sont explorés et exploités individuellement sous la commande de l'unité de gestion. Mais il ne faut pas y voir pour autant une limitation du système de l'invention. D'autre part, ce système peut être utilisé avec toutes sortes de modes de traitement des signaux et de modes de détection des évènements à prendre en considération pour chaque source d'observation. On peut par exemple prévoir des visualisations ou enregistrements sur périphériques, la mise en route de signalisations et de télécommandes, l'exploitation sur ordinateur, pour les uns, et pour les autres, des détecteurs d'intrusions, des capteurs d'alarmes, ou tout circuit électrique en boucle qui s'ouvre ou se ferme lorsque survient l'évènement à détecter, notamment une alarme.In most applications, the observation sources are mainly constituted by cameras or video recorders, sources of video signals which are explored and exploited individually under the control of the management unit. However, this should not be seen as a limitation of the system of the invention. On the other hand, this system can be used with all kinds of signal processing modes and event detection modes to be considered for each observation source. We can for example provide visualizations or recordings on peripherals, the start-up of signals and remote controls, the operation on computer, for some, and for others, intrusion detectors, alarm sensors, or any electrical circuit in a loop which opens or closes when the event to be detected occurs, in particular an alarm.

On décrira maintenant plus en détail une forme de réalisation particulière de l'invention qui en fera mieux comprendre les caractéristiques essentielles et les avantages, étant entendu toutefois que cette forme de réalisation est choisie à titre d'exemple et qu'elle n'est nullement limitative. Sa description est illustrée par les dessins annexés, dans lesquels :

  • - la figure 1 représente un premier schéma, partiel, du dispositif de surveillance selon l'invention, dans le cas particulier décrit, montrant en particulier l'unité de commutation et l'unité de gestion;
  • - la figure 2 représente dans un autre schéma, les différents organes essentiels de ce dispositif;
  • - la figure 3 est un schéma synoptique illustrant notamment la sélection des schémas de commutation et l'état des ordres de priorité correspondant à l'unité de commutation;
  • - la figure 4 illustre dans un autre schéma seroptique, la commande de l'unité de commutation.
A particular embodiment of the invention will now be described in more detail which will make it better understand the essential characteristics and the advantages, it being understood however that this embodiment is chosen by way of example and that it is in no way limiting. Its description is illustrated by the appended drawings, in which:
  • - Figure 1 shows a first diagram, partial, of the monitoring device according to the invention, in the particular case described, showing in particular the switching unit and the management unit;
  • - Figure 2 shows in another diagram, the various essential organs of this device;
  • - Figure 3 is a block diagram illustrating in particular the selection of switching schemes and the state of priority orders corresponding to the switching unit;
  • - Figure 4 illustrates in another seroptic diagram, the control of the switching unit.

Comme le montrent les figures 1 et 2, le dispositif de surveillance comprend essentiellement une unité de commutation 1, comprenant deux matrices d'autocommuta- tion 2 et 3, et une unité de gestion dont l'organe principal est un microprocesseur 4, auquel est associée une mémoire morte programmable (PROM) 5, qui peut être séparée ou intégrée.As shown in FIGS. 1 and 2, the monitoring device essentially comprises a switching unit 1, comprising two self-switching matrices 2 and 3, and a management unit, the main body of which is a microprocessor 4, to which is associated a programmable read only memory (PROM) 5, which can be separated or integrated.

Sur la figure 2, on a aussi représenté une interface d'entrée-sortie 6, par laquelle transitent les informations provenant en série de différentes boucles alarmes à scruter, pour être gérées par le microprocesseur, ainsi que des signaux de commande produits par ce dernier, pour commander par exemple la mise en route et l'arrêt d'un magnétoscope. Chaque boucle alarme comporte une caméra vidéo qui filme une scène dans la zone qu'elle observe et le magnétoscope permet d'enregistrer, en série, pour visualisation ultérieure, les scènes observées par les caméras scrutées successivement.In FIG. 2, an input-output interface 6 has also been represented, through which the information coming in series from different alarm loops to be scanned, in order to be managed by the microprocessor, and control signals produced by the latter , to control for example the starting and stopping of a video recorder. Each alarm loop includes a video camera which films a scene in the area it observes and the video recorder makes it possible to record, in series, for later viewing, the scenes observed by the cameras scanned successively.

Les boucles alarmes n'ont pas été figurées individuellement. Elles sont constituées de manière classique, chacune avec un détecteur d'alarme sur un circuit électrique en boucle qui s'ouvre ou se ferme lorsque le détecteur d'alarme est actionné et transmet ainsi une information d'alarme au microprocesseur. A chaque boucle est associé un code qui caractérise le détecteur d'alarme et qui peut aussi caractériser une caméra, selon une correspondance pré-établie entre boucles alarmes et caméras.The alarm loops were not shown individually. They are constituted in a conventional manner, each with an alarm detector on an electric loop circuit which opens or closes when the alarm detector is actuated and thus transmits alarm information to the microprocessor. Each loop is associated with a code which characterizes the alarm detector and which can also characterize a camera, according to a pre-established correspondence between alarm loops and cameras.

L'unité de commutation est constituée à partir de matrices d'autocommutation, qui peuvent être par exemple, dans le cas particulier décrit, les matrices 2 et 3 de la figure 1, du type connu sous la désignation commerciale MT 8804 du fabricant américain Mittel. L'emploi de deux matrices conjugées permet d'obtenir huit entrées d'informations El à E8 et huit sorties S1 à S8. La commutation entre les voies d'entrée et les voies de sortie s'effectue automatiquement sous l'effet de signaux de commande en série provenant du calculateur. La succession des ordres de commande s'effectue elle-même selon trois schémas différents qui sont sélectionnés par un ordre de priorité reçu par le microprocesseur.The switching unit is formed from self-switching matrices, which can be, for example, in the particular case described, matrices 2 and 3 of FIG. 1, of the type known under the trade designation MT 8804 from the American manufacturer Mittel . The use of two conjugate matrices makes it possible to obtain eight information inputs El to E8 and eight outputs S1 to S8. Switching between the input channels and the output channels takes place automatically under the effect of serial control signals from the computer. The succession of control orders is itself carried out according to three different diagrams which are selected by a priority order received by the microprocessor.

Les entrées El à E8 de l'unité de commutation admettent aux matrices, par l'intermédiaire de circuits individuels d'adaptation réglables 7, les différents signaux vidéo provenant des appareils de surveillance, soit ici, de huit caméras. Les signaux obtenus après commutation sur sept des sorties, S1 à S7, peuvent être envoyés vers un moniteur de contrôle ou un magnétoscope visualisant l'état de toutes les commutations, et éventuellement les images correspondantes.The inputs E1 to E8 of the switching unit admit to the matrices, by means of individual adjustable adaptation circuits 7, the various video signals coming from the surveillance devices, that is to say here, from eight cameras. The signals obtained after switching on seven of the outputs, S1 to S7, can be sent to a control monitor or a video recorder displaying the state of all the switches, and possibly the corresponding images.

On peut aussi utiliser l'une seule de ces sorties pour visualiser ou enregistrer la scène saisie par une caméra prioritaire sélectionnée par la commutation.One of these outputs can also be used to view or record the scene captured by a priority camera selected by switching.

La huitième sortie est connectée au microprocesseur 4 par l'intermédiaire d'un circuit 8 de mise en forme et synchronisation.The eighth output is connected to the microprocessor 4 via a circuit 8 for shaping and synchronization.

La figure 2 fait apparaître d'autres éléments incorporés dans l'unité de gestion du dispositif. On voit ainsi un dispositif d'incrustation 9 qui permet d'introduire sous la commande du microprocesseur, dans les signaux de sortie de l'unité de commutation, des indications qui se superposent aux images visualisées. On peut ainsi incruster par exemple l'heure à laquelle survient une alarme et un numéro de référence de la caméra alors sélectionnée, dans l'image vidéo correspondante.FIG. 2 shows other elements incorporated in the management unit of the device. We thus see an overlay device 9 which makes it possible to introduce, under the control of the microprocessor, into the output signals of the switching unit, indications which are superimposed on the images displayed. It is thus possible, for example, to embed the time at which an alarm occurs and a reference number of the camera then selected, in the corresponding video image.

Par ailleurs, un clavier 11 permet l'introduction manuelle d'informations ou de commandes. Il peut servir à modifier l'heure de référence pour l'incrustation de l'indication horaire. Il peut aussi servir à programmer le mie oprocesseur de la commande cyclique de commutation en fiant les paramètres qui sont normalement imposés par la mémoire 5. Il sert surtout à modifier le schéma de commande de la commutation en introduisant manuellement une commande de priorité qui détermine l'aiguillage des signaux, en fonction d'une sélection opérée par l'utilisateur.Furthermore, a keyboard 11 allows manual input of information or commands. It can be used to modify the reference time for the insertion of the time indication. It can also be used to program the mie oprocessor of the cyclic switching command by relying on the parameters which are normally imposed by memory 5. It is used above all to modify the switching control diagram by manually introducing a priority command which determines the signal routing, based on a selection made by the user.

Enfin, un commutateur auxiliaire 12, recevant ses ordres de commande du microprocesseur 4, permet d'agir sur les caméras ou les alarmes de chaque boucle, en sélectionnant celle qui est commandée en fonction de la sélection opérée par l'unité de commutation.Finally, an auxiliary switch 12, receiving its control commands from the microprocessor 4, makes it possible to act on the cameras or the alarms of each loop, by selecting the one which is controlled according to the selection made by the switching unit.

La figure 3 se comprendra par elle-même, étant précisé qu'elle illustre comment le dispositif exploite les ordres de priorité qu'il reçoit dans la sélection des schémas de scrutation des différentes caméras. On voit que dans la réception des signaux successifs, la priorité dans la commutation est donnée d'abord par une boucle sur laquelle survient une alarme, sinon par l'ordre cyclique imposé par la mémoire programmable, et sinon par l'ordre de commande donné manuellement au clavier. De la sélection ainsi opérée, dépendent ensuite les ordres de commande transmis à l'unité de commutation, ainsi que ceux qui commandent l'incrustation et les sorties du commutateur auxiliaire.Figure 3 will be understood by itself, it being specified that it illustrates how the device uses the orders of priority that it receives in the selection of the scanning patterns of the different cameras. We see that in the reception of successive signals, priority in switching is given first by a loop on which an alarm occurs, otherwise by the cyclic order imposed by the programmable memory, and otherwise by the command given manually on the keyboard. From the selection thus made, then depend the control orders transmitted to the switching unit, as well as those which control the overlay and the outputs of the auxiliary switch.

Au niveau de l'unité de commutation, le signal de mise en route de la surveillance commande la remise à zéro des mémoires des matrices de commutation (figure 4). A l'apparition d'un ordre à l'entrée des informations série, le code de référence correspondant est mémorisé, avec commande d'effacement de la mémoire des matrices de commutation, et la synchronisation des images vidéo est assurée (synchronisation verticale). En l'absence d'un caractère d'ordre particulier, le signal de commande de commutation est transmis à un convertisseur série/parallèle qui transmet les états logiques nécessaires au fonctionnement de la commutation.At the level of the switching unit, the start-up monitoring signal commands the resetting of the memories of the switching matrices (FIG. 4). When an order appears at the input of the serial information, the corresponding reference code is memorized, with command to erase the memory of the switching matrices, and the synchronization of the video images is ensured (vertical synchronization). In the absence of a particular order character, the switching control signal is transmitted to a serial / parallel converter which transmits the logic states necessary for the operation of the switching.

Naturellement, l'invention n'est en rien limitée par les particularités qui ont été spécifiées dans ce qui précède ou par les détails du mode de réalisation particulier choisi pour illustrer l'invention. Toutes sortes de variantes peuvent être apportées à la réalisation particulière qui a été décrite à titre d'exemple et à ses éléments constitutifs sans sortir pour autant du cadre de l'invention. Cette dernière englobe ainsi tous les moyens constituant des équivalents techniques des moyens décrits ainsi que leurs combinaisons.Naturally, the invention is in no way limited by the features which have been specified in the foregoing or by the details of the particular embodiment chosen to illustrate the invention. All kinds of variations can be made to the particular embodiment which has been described under example and its constituent elements without departing from the scope of the invention. The latter thus includes all the means constituting technical equivalents of the means described as well as their combinations.

Claims (8)

1. Système de surveillance du type comportant une unité de gestion (4) de signaux d'information provenant de plusieurs sources d'observations scrutées à tour de rôle ou en parallèle, caractérisé en ce qu'il comporte une unité de commutation programmable (1) pour déterminer un ordre de scrutation desdites sources d'observation et des moyens pour commander la scrutation par priorité d'une source d'observation particulière.1. A surveillance system of the type comprising a management unit (4) of information signals coming from several observation sources scrutinized in turn or in parallel, characterized in that it comprises a programmable switching unit (1 ) to determine a scan order of said observation sources and means for controlling the priority scanning of a particular observation source. 2. Système de surveillance selon la revendication 1, caractérisé en ce que ladite unité de commutation comporte au moins deux cartes d'autocommutation à structure CMOS (2-3).2. Monitoring system according to claim 1, characterized in that said switching unit comprises at least two self-switching cards with CMOS structure (2-3). 3. Système de surveillance selon la revendication 1 ou 2, caractérisé en ce qu'il comporte des moyens pour déterminer ladite priorité sur détection d'une alarme et en fonction d'une correspondance préétablie entre alarmes et sources d'observation.3. Monitoring system according to claim 1 or 2, characterized in that it comprises means for determining said priority on detection of an alarm and according to a pre-established correspondence between alarms and observation sources. , 4. Système de surveillance selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte des moyens pour déterminer ladite priorité sur l'intervention d'un ordre manuel.4. Surveillance system according to any one of the preceding claims, characterized in that it includes means for determining said priority over the intervention of a manual command. 5. Système de surveillance selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte des moyens pour modifier les paramètres d'un ordre de scrutation cyclique imposé à la commutation en l'absence d'un ordre prioritaire.5. Monitoring system according to any one of the preceding claims, characterized in that it comprises means for modifying the parameters of a cyclic polling order imposed on switching in the absence of a priority order. 6. Système de surveillance selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comporte des caméras vidéo constituant certaines au moins desdites sources d'observation.6. Surveillance system according to any one of the preceding claims, characterized in that it comprises video cameras constituting at least some of said observation sources. 7. Système de surveillance selon la revendication 6, caractérisé en ce qu'il comporte des moyens pour visualiser une scène observée par une caméra sélectionnée par ladite commutation.7. Monitoring system according to claim 6, characterized in that it comprises means to view a scene observed by a camera selected by said switching. 8. Système de surveillance selon la revendication 7, caractérisé en ce qu'il comporte des moyens pour incruster dans l'image vidéo issue de ladite caméra sélectionnée, une indication sélectionnée en concommittance.8. Surveillance system according to claim 7, characterized in that it comprises means for embedding in the video image coming from said selected camera, an indication selected in conjunction.
EP85400007A 1984-01-17 1985-01-04 Surveillance system switching between more observation sources Withdrawn EP0149569A3 (en)

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Application Number Priority Date Filing Date Title
FR8400645 1984-01-17
FR8400645A FR2558286B1 (en) 1984-01-17 1984-01-17 MULTIPLE OBSERVATION SOURCE SWITCHED MONITORING SYSTEM

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EP0149569A3 EP0149569A3 (en) 1985-08-21

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Publication number Priority date Publication date Assignee Title
WO1996003005A1 (en) * 1994-07-15 1996-02-01 Isec Intelligent Security Ab A device at tv surveillance
WO2011109935A1 (en) * 2010-03-09 2011-09-15 Global Advanced Vision Ltd A surveillance system and method

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EP0149569A3 (en) 1985-08-21
FR2558286A1 (en) 1985-07-19

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